Reaction of<i>E</i>-2-arylidene-1-indanones, Z-aurones, Z-1-thioaurones and Z-2-arylidene-2,3-dihydro-1<i>H</i>-indol-3-ones with diazomethane
作者:Albert Lévai、Tamás Patonay
DOI:10.1002/jhet.5570360328
日期:1999.5
E-2-arylidene-1-indanones 1a-h and Z-aurones 3a-c with diazomethane provided trans-spiro-1-pyrazolines 2a-h and 4a-c, respectively, as sole products. However, the same cycloaddition of Z-1-thioaurones 5a-f afforded a mixture of Z-α-methyl-1-thioaurones 6a-f and trans-cyclopropane derivatives 7a-f as a result of the spontaneous denitrogenation of the initially formed 1-pyrazolines. Similar reaction of Z-2-arylidene-2
E -2-芳基-1-茚满酮1a-h和Z-金酮3a-c与重氮甲烷的1,3-偶极环加成分别提供反-螺-1-吡唑啉2a-h和4a-c作为唯一产物。然而,由于最初形成的化合物1的自发脱氮作用,Z-1-硫代金酮5a-f的相同环加成得到了Z-α-甲基-1-硫代金酮6a-f和反式环丙烷衍生物7a-f的混合物。-吡唑啉。Z-2-芳基-2,3-二氢-1 H-吲哚-3-酮8a,b与重氮甲烷的类似反应产生反式-环丙烷9a,b。通过核磁共振光谱测量已经阐明了合成化合物的结构和立体化学。
One-Step Synthesis of Thioaurones
作者:M. Grazia Cabiddu、Salvatore Cabiddu、Enzo Cadoni、Stefania De Montis、Claudia Fattuoni、Stefana Melis、Michele Usai
DOI:10.1055/s-2002-28523
日期:——
A rapid, one-step preparation of 2-(arylmethylidene)-1-benzothiophen-3-ones (thioaurones) using directed α-metallation, ring closure and aldol-type condensation is described. The reaction leads exclusively to the Z-isomer.
Synthesis of dispiro[1-benzothiophene-2,3'-pyrrolidine-2',3”-indoline]-2”,3-diones in cycloaddition reaction
作者:Ying Zhou、Yulin Huang、Guihua Tang、Xiaofang Li
DOI:10.1007/s10593-019-02575-6
日期:2019.11
cycloaddition of azomethine ylides derived from isatin and sarcosine to (Z)-2-(arylmethylidene)-1-benzothiophen-3(2H)- ones afforded novel dispiro[1-benzothiophene-2,3'-pyrrolidine-2',3”-indoline]-2”,3-diones in moderate yields. The structures of all the products were characterized by NMR, IR, HRMS together with X-ray crystallographic analysis. The reaction gives two diastereomeric products. This result is different
Cu-Catalyzed and iodine mediated synthesis of thioaurones <i>via in situ</i> C–S bond generation using xanthate as a sulfur surrogate
作者:Palanisamy Soundarya、Govindasamy Sekar
DOI:10.1039/d2ob01211a
日期:——
An efficient method for synthesizing thioaurones has been developed using xanthate as an odorless sulfur surrogate. This reaction's key success lies in the use of iodine as a reagent, which promotes the α-iodination followed by cyclization of saturated ketones. This methodology has also been demonstrated with less reactive 2′-bromochalcones in good yield. Synthesis of the red isomer of indigo, i.e
Cooperative Activating Effect of Tertiary Amine/DMSO on Elemental Sulfur: Direct Access to Thioaurones from 2′-Nitrochalcones under Mild Conditions
作者:Thanh Binh Nguyen、Pascal Retailleau
DOI:10.1021/acs.orglett.7b03547
日期:2018.1.5
A newmode for the activation of elemental sulfur is reported. In the presence of both DMSO and a tertiary aliphatic amine (triethylamine or N-methylpiperidine), this element reacts directly with a wide range of 2′-nitrochalcones 1 to provide the corresponding thioaurones 2 in high yields even at room temperature and in the absence of transitionmetal catalyst.